Use 7 data bits on RS-232

BlankVector · 19 March 2017, 20:45

As an exercise, I'm trying to add support in EmuTOS for old Microsoft serial mouse plugged on Amiga RS-232 port. The protocol is described there. It uses 1200 baud, but only 7 data bits and no parity.

The protocol indicates that each mouse change sends a packet of 3 "bytes". But I only receive the first byte (through RBF interrupt).

By reading the docs, it seems that Amiga hardware is only able to receive 8 data bits with no parity, or 9 bits (i.e. 8 data bits and 1 parity bit).

My question: Does the Amiga RS-232 port support receiving 7-bit data, without parity?

19 March 2017, 20:45	#1
BlankVector Registered User Join Date: Jun 2012 Location: France Posts: 183	Use 7 data bits on RS-232 As an exercise, I'm trying to add support in EmuTOS for old Microsoft serial mouse plugged on Amiga RS-232 port. The protocol is described there. It uses 1200 baud, but only 7 data bits and no parity. The protocol indicates that each mouse change sends a packet of 3 "bytes". But I only receive the first byte (through RBF interrupt). By reading the docs, it seems that Amiga hardware is only able to receive 8 data bits with no parity, or 9 bits (i.e. 8 data bits and 1 parity bit). My question: Does the Amiga RS-232 port support receiving 7-bit data, without parity? Last edited by BlankVector; 19 March 2017 at 20:54.

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